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This is refering to the 550K3 NOT the 500K3
Please don't confuse the 500K3 with the 550K3. Whilst they may share the K3 reference that's really the only thing they do share. Different seat, different tank, different swinging arm, different clutch, different gearbox, they do have some common parts as both are derivatives of the 500-4, however the 500K3 was really just a continuation of the 500K2, the 550K3 only ever got blue faced clocks, those clocks have a totally different part number from any other bike, they share the same clocks as the 550F2. The 500K3 were green, as were the 500K2 clocks. No 500K3 was fitted with blue clocks to my knowledge.The problem with the US site is that they hear 500 when they think of a K3, although they did get the 550K3 I don't think it was that popular over there.I'd agree with Tomb. Looks like it started out an F model and frame was replaced with the K3 frame. Or it could be it started out a K3 and the engine and some other parts were replaced with F parts. For instance, if it was a 76 F2 it would have had blue clocks, unless of course the same accident that wrote the frame off also took out the clocks, not unrealistic to think that.Probably easier to agree it's a bit of a bitsa bike, no harm in that, so long as it works and is safe it's fine.